General Motors says it has built 130 self-driving Chevrolet Bolt electric cars at a factory in suburban Detroit.

The cars are equipped with GM's second-generation self-driving software and equipment. They will join 50 self-driving Bolts that are already being tested in San Francisco; Scottsdale, Arizona; and the Detroit area.

CEO Mary Barra says GM is the first automaker to assemble self-driving vehicles in a mass-production facility. GM has been building self-driving Bolts at its Orion Assembly Plant since January.

Barra says GM eventually plans to place the self-driving Bolts in ride-hailing fleets in major U.S. cities, but she gave no target date. She says the new vehicles will help GM accelerate its testing in urban environments.